Grinding machine



Jan. 5, 1932. R. E. w. HARRISON ET Al. 1,840,231

GRINDING MACHINE Filed June 28, 1927 2 Sheets-Sheet l Jan. 5, 1932. R.E. w. HARRISON ET AL 1,840,231

GRINDING MACHINE Filed June 28, 1927 2 Sheets-Sheet 2 f/'/ GwennPatented Jan. 5, 1932 I PATENT OFFICE ROBERT E W. HARRISON AND FRED S.HAAS, OF CINCINNATI, OHIO, ASSIGNORS TO CINCINNATI GRIN DERSINCORPORATED, OF

OHIO

CINCINNATI, OHIO, A CORPORATION Ol' GRINDING MACHINE Application ledJ'une 28,

This invention relates to improvements in grinding machines and hasparticular reference to a machine for the grinding of cam shafts or likebodies, having eccentric portions or portions of different shapes ordiameters.

One of the objects of the present invention is the provision of amachine for the production of a cam shaft or like article which shall beentirely automatic in operation from inception to completion of thegrinding of the several portions thereof.

A further object of the invention is the provision of a machine for theproduction of cam shafts or the like, capable of cyclic operation toinsure a rapid approach of the grinding Wheel and Work, coupled with aproper relative feeding action of the parts during grinding and a finalrapid withdraWal at the completion of the grinding operation.

AnotherA object of the present invention is the provision of an improvedmachine which may be employed either for reproduction of cam shafts froma master cam or may itself be satisfactorily employed for the formationof the master cam.

An additional object of the present invention is the provision of animproved yieldable control mechanism for the moving parts of a grinderwhich will insure most efficient and accurate reproduction of aprescribed templet or work pattern.

Other objects and advantages of the present invention should be readilyapparent by reference to the following specification taken in connectionwith the accompanying drawings forming a part thereof, and it will beunderstood that we may make any modifications in the specific structuraldetails hereinafter disclosed Within the scope of the appended claims,without departing from or exceeding the spirit of the invention.

Figure l is a front view of a machine embodying the improvements inquestion.

Figure 2 is a vertical sectional view as on the line 2-2 of Figure 1.

Figure 3 isa view similar to Figure 2, but illustrating the severalparts in the retracted or disengaging position.

1927. Serial No. 202,108.

Figure 4 is a diagrammatic view of the operatlve parts of the machineand control circuits therefor.

Figure 5 is a fragmentary section on the line 5 5 of Figure l, and

Figure 6 is a detail view of oscillator mechanism.

One embodiment of the invention has been illustrated in the drawings inwhich similar characters of reference are employed to denotecorresponding parts throughout the several views.

The numeral 10 designates the bed or base of the machine, having on thefront thereof the guard portion 11, within which is disposed the controlpatterns and mechanisms for the machine. These include the bar 12bearing a number of knife edged disks 13 retained in a longitudinallyadjusted position on the rod as by set-screws 14.

There is also contained within this guard portion the master earn shaft15, bearing a plurality of master cams 16 of size and shape to properlyguide or shift the wheelhead for accurate production of proper camportions 17 on the .shaft 18 being ground. By reference to Figures 1 and5 it will be noted that shaft 18 is suitably locked to rotate withspindle 19 in headstock 20. This spindle is provided with a gear 21meshing through idler 22 with gear 23 on the stub shaft 24 havingflanged head 25 bolted or suitably secured `to head 26 of the shaft l5.The interconnection of parts is such that the two shafts will besimultaneously synchronously rotated. This rotation is effected as byworm 27 meshing with worm wheel 28 on shaft 24. This worm may becontinuously operated from any suitable source of power not herespecifically illustrated, and serves to rotate the work and itscontrolling cam at the proper work rotation speed.

The bed 10 is provided with the Ways 29 for the longitudinally shiftabletable member 30, which is movable along the bed as by the feed screw 31.This screw is suitably secured on the underside of table 30 and hasmounted thereon the gear nut 32 held against longitudinal movement withrespect to the bed, so that when the nut is rotated in one the spindledirection or the other'a correspondin movethis movement use is preferablo effect made of worm 33 on shaft 34 couplablet rough the magneticclutch 35 or equlvalent mechanism with the reversible drive motor 36.Reversing switch 37 is disposed in the motor line ment will be impartedto the table.

and coupled with actuating handle 38 at the left of the machine. A link39 in turn connects handle 38 with handle 40 at the right of the machineso that the switch may be actuated from either position to reverse themotor drive. The table 30 is preferably provided with control dogs 41and 42 at o pposite ends to throw the switch from either operativeposition into an intermediate neutral position as is diagrammaticallyindlcated in connection with Figure 4.

In the grinding of cam shafts there are certain conditions to beconsidered qulte different from ordinary cylindrical grinding of work.The shaft 18 to be ground must be formed with a plurality of camportions 17 having the points 43 of the cams disposed in' differentradial planes as respects the shaft and at intermittent or differentlongitudinally spaced positions along the shaft. For proper grindingitis therefore necessary that means be provided for imparting an in andout movement to the grinding wheel to produce the proper shape of anindividual cam, that means be provided for retracting the grinding wheelaway from the work when completed and additional means be utilized forlaterally shifting the wheel into engagement with the subsequent portionof the work piece to be ground.

In the preferred embodiment of the invention here illustrated thecomplete cycle of operation for formation of the entire series of camson the shaft is shown as beingI automatically performed but it is to beunderstood that certain of the structural elements are capable of usewith manually in place of j 16. It is provided with a piston cylinder 55automatically controlled cycle.

For effecting the grinding, use is made of the grinding wheel 44 havingits spindle 45 suitably journalled in the grinding wheel carriage46.This carriage bears the wheel driving motor 47 which is thereforeshiftable as a unit with the grinding wheel. Carriage 46 has guides 48movable onthe ways 49 of intermediate slide 50. Slide 5() in turn hasguides 51 riding on ways 52 of the table 30. As a result, the grindingwheel is movable both with and with respect to intermediate slide 50.

Slide 50 is provided with a bracket 53 having a contact roller 54`for`selective engagement with any one of the master cams in which isslidably mounted a piston 56 having the rod 57 extending rearwardly andbearin an .adjustable contact or screw 58 norma y engaging lug 59o`ntable 30. Compressed air or other yieldable fluid is intended to beintroduced into cylinder 55 as at port- 60, whereby when portion 58 isin contact with lug 59 holding the piston it- .self stationary theinflux or building up of pressure within the cylinder will exert a forceagainst the intermediate slide, urging roller 54 against cam 16. As theHuid is compressible, rotation of the vmaster cam shaft will cause anindividual cam toimpart a back and forth reciprocating movement to theintermediate slide and parts associated therewith. The connectionbetween the intermediate slide and the grinding wheel carriage is in theform of a depending iange 61 and piston rod 62. This rod 62 has athreaded connection as at 63 with the iiange andis capable of rotationto adjust the in or out position of the carria e as respects theintermediate slide. This a justment is preferably effected through thetrain of gears 64 at the rear of the machine, terminating in the stubshaft 65 provided with a mitre gear 66. Gear 67 serves through shaft 68and pair of gears 69 to operatively connect the gear train 64 with theoperating hand wheel 70. Shaft 68 and handle rod 71 are jointlyjournalled in the swivelled bracket 72 which may therefore be oscillatedto present hand wheel in most satisfactory operating position, dependingon the general position of the grinding wheel head as respects theoperator. It will be understood that the adjustment here indicated isprimarily intended for size control as for compensation of wheel wear.To this end screw rod 62 is provided at its forward end with anadjustable stop contact- 73 adapted to engage the electrical stop switchcontact 74 supported by lug 59 to limit automatically the inward feedingmovement of the grinding wheel. c

The gear train mechanism just described is for purposes of adjustmentonly, while to normally provide for a relative in and out movementbetween grinding vwheel and intermediate slide there is secured on thepiston rod 62 a piston 75 capable of back and forth movement in thecylinder 76 attached to the intermediate slide, and as controlled byintroduction of actuating fluid through either port 7 7 or port 78 asindicated in Figure 4. Introduction of fluid through .the port 77 willmove the piston inward relative" to the intermediate slide shifting withit the carriage, this being controlled through reversing valve 79 at arate determined by pump 8O to cause desired feeding movement" of thegrinding wheel relative to the intermediate slide at the same time thatthe general in and out position of the grinding wheel for shape issecured by interengagement of master cam 16 with roller 54. When thegrinding is completed valve 79 is reversed, coupling port 77 with theexhaust side of the l l carrying with it piston hydraulic control systemand port 78 with the pressure, so that the piston is retracted from theposition shown in Figure 2 to that shown in Figure 3, carrying back thegrind- 5 ing wheel carriage with it. Additionally, on this reversalhydraulic lead line 81 forces a given volume of fluid through port 82into the. rapid return cylinder 83 carried by the table 30. This shiftspiston'84 rearwardly rod 85 which is secured to flange 61. In thismanner arapid reverse movement of the entire intermediate slide andgrinding wheel carriage withdrawing the parts from engagement with l5the work to a shiftable position as illustrated in Figure 3 isaccomplished. This is preferably against the pressure of the compressible fluid in cylinder 55, with the result that on subsequentreversal of valve 79 allowing pressure in cylinder 83 to exist, the

expansion of the fluid willcause a rapid inward movement of the partsuntil roller 54 engages its master cam and at the same time a relativelyslow feeding movement of the grinding wheel carriage on the intermediateslide.

Figure 4 contains a diagram of the several control mechanisms forrendering the complete cycle of operations of the machine enr tirelyautomatic.

That the manner of operation of the machine as anentirety may be bestunderstood,

I particular reference is invited to the diagrammatic illustration ofthe controls contained in Figure 4 in connection with the structuralfeatures illustrated and in part previously described. Considering themachine .set with the table at one end of the bed initial lateralmovement of the table may be effected by shifting switch 37 from neutralposition to close the motor circuit `A--A-A and actuate the drive motor36.

Coupled with the switch actuating mechanism, including lever 38 is asecond switch 184 which controls the line circuit of the machine, sothat when the motor switch 37 is in a neutral position all. power willbe shut oft from the machine, while when. the switch 37 is actuated tooperate the motor in either direction, switch 184 will also be actuatedto provide power for energization of the several automatic controls.

At the point of restot` the machine intermediate slide 50 is inretracted position as shown in Figure 3, the limit of this retract-edmotion beingr the interengagement of piston 75 with the rear of cylinder76. In this posi- 'tion the switch control contact 185 engages rail 86,causing switch 87 to be moved in posiy6C' tion to close the circuit frompowerline 88 to y intermediate conductor 89. Suitable means such asspring 90 throws the switch into open position .on disengagement of thecontact and rail for the purpose hereinafter described.

The other terminal of line 89 is connected action continues till withswitch plunger 91 normally held in a forward position by spring 92, sothat switch blade 93 again closes a circuit through line 94, solenoid 95and ground line 96. This actuation of the solenoid moves core rod 97inward, closing switch 98 against action of spring 99 and completingcircuit 100-101 of the magnetic or magnetically controlled clutch 35.Under these conditions motor 36 will drive worm 33 in the directiondetermined'by the reversing switch and will thus actuate nut 32 and movethe table toward the left if the parts are in the position indicated inFigure 1. As the table progresses in this direction, switch plunger 91is brought into engagement with the first of the series of disks 13which depress the plunger with a snap effect on switch b-lade 93,breaking circuit 94, deenergizing solenoid 95 when spring 99 opensswitch 98 and causes disconnection of clutch 35 stopping the traverse ofthe table.

At the same time the movement of the switch blade 93 closes through line102 and ground line 96.1 the circuit of solenoid 103. 'lhis solenoidactuates shift rod 104 to the left or into position shown in Figure 4,reversing the eti'ect of the hydraulic circuit. The flow will then be'from pump 80 through line 77 to the rear ot thc piston 75 moving thepiston forwardly in the cylinder and causing the inteed movement ot thegrinding wheel and grinding wheel carriage relative the intermediatesupporting slide. At the same time the relief of pressure on the forwardside of pistons 75 and 84 allows eX pansi'on of the fluid in cylinder 55to move the intermediate slide forward, so that roller 54 engages theappropriate master dcam 16, the position of disk 13 being such that thecross feed is stopped in proper alinement with this master cam.Consequently, as the work and master cam shaft are correspondinglyrotated the in and out motion following the master cam will be impartedto the intermediate slide and grinding 'wheel carriage mounted thereonas previously described. At the same time through action o't piston 75there will be a lgradual inward feeding movement of the grinding wheelitselt' with respect its movable intermediate slide as the stock isremoved rom the article being ground. This the article has been reducedto proper size, at which time the adjustable contact screw 73 on thefront ot the piston rod 63 will contact with and actuate switch member74. This serves to close the wheel feed reversing circuit 1051OG-107,which includes a solenoid 108.

As the inward movement of the intermediate slide has withdrawn contact185 from engagement with rail 86, the circuit through solenoid 103 hasbeen broken and the solenoid is no longer operative. Consequently,

solenoid 108 may shift rod 104 to the right I'T- reversing valve 79'through action of the rack 109 and segment 110. This reversal willcause the volume of fluid in the pressure line to flow into cylinders 76and 83 with a consequent reversal of movement of both intel'- mediateslide and grinding wheel to the positions shown in Figure 3.

On this movement disengagement of contact 73 and switch 74 releases thisswitch breaking the circuit through solenoid 108, the valveremainingstationary however, so that the parts remain as described until inrearmost position when the normally opened switch 87 is again closedcompleting the c ir, cuit 88-89. This again actuates clutch 35 to causea cross feed of the table till again stopped by engagement of the nextdisk 13 with the switch plunger 91 and the cycle is repeated insequential cross feed, infeed grinding and return movements until theentire series of disks 13 have been utilized and the proper cams ground.Continued motion of the table will then bring dog 42 intor engagementwith lever 38, throwing the switch 37 coupled therewith into its neutralposition and breaking the entire circuit switch 184 when the entiremachine will come to rest. A new work piece can then be readilyintroduced by the operator and the :switch 37 thrown in reversedirection reversing motor 36. Inasmuch as this closes the main linecircuit switch 184 and the switch setting of the solenoid circuit 94-96has not been disturbed, clutch will again be actuated and the tableshifted in a reverse direction under control of the switch plunger 91and other parts. The machine thus automatically operates in an identicalmanner in both directions to perform a complete series of operations andfinally come to rest. It will be particularly noted that by theconstruction here provided the only requirements of the operator are theremoval and replacement of work pieces and a proper gauging or checkingto make sure that proper size is being maintained by suitable inwardadjustment of the grinding wheel when necessary. Consequently, a singleoperator can satisfactorily handle several machines resulting in maxlmumproduction per man hour of labor.

To avoid grooving of the grinding wheel during the reproduction of alarge number of work pieces, a suitable mechanism is preferably providedfor imparting slight oscillation to the grinding wheel spindle 45. Asuitable mech ani sm for this purpose is illustrated in Figure 6 andcomprises a barrel cam 111 having a cam groove 112 and an opposed barrelcam 113 having the cam groove 114. Intermeshing gears 115 and 116 on thetwo cams serve to rotate same, but due to a difference in number ofteeth on gears there is a slight differential in speed rotation. Carriedby the casing 117 therefor is a guide 118 for the cam block 119 which isjointly engaged in grooves 112 and 114. Consequently, as there is adifferential rotation of the two grooves the pin will follow groove 114since this cam is fixed against axial movement andl will cause arelative back and forth axial shifting of the grinding wheel spindle 45,as should be readily apparent by reference to Figure 6.

1. A machine of the character described, including a work support and agrinding wheel, means for automatically varying the relationship of theparts during grinding to control the shape produced on a work lece bythe grinding wheel, means for relatlvely shifting said parts in anangularly related direction to vary the general area of the work engagedby the grinding wheel, and means for automatically stopping all relativemovement of the parts when a series of sequential grinding operations ona plurality of axially displaced portions of the work has beencompleted.

2. A machine of the character described, including a bed, a work holderand a pattern supported by the bed for synchronous rotation, a slidesupported on the bed and having a pattern follower, means for urging thepattern and follower into engagement one with the other, a grindingwheel carriage mounted on the slide and movable therewith and relativethereto, and means for automatically effecting the relative movement ofthe carriage and slide to progressively remove stock from a work piecein the work holder in a path continuously determined by the pattern andfollower.

3. A machine of the character described, including a bed, a Work holderand a pattern supported by the bed for synchronous rotation, a slidesupported on the bed and having a pattern follower, means for urging thepattern and follower into engagement one with the other, a grindingwheel carriage mounted on the slide and movable therewith and relativethereto, means for automatically effecting the relative movement of thecarriage and slide to control the rate of progress'ive stock removal,and additional means for positively relatively adjusting the slide andcarriage te vary the ultimate effective position of the grinding wheelsurface.

4. A machine of the character described, including a bed, a work holderand a pattern supported by the bed for synchronous rotation, a slidesupported on the bed and having a pattern follower, means for urging thepattern and follower into engagement one with the other, a grindingwheel carriage mounted on the slide and movable therewith and relativethereto, means for automatically effecting the relative movement of thecarriage and slide, and means for automatically limiting the workapproaching movement of the grinding wheel carriage irrespective of themovement of the slide.

5. A machine of the character described, including a bed, a work holderand a pattern supported by the bed for synchronous rotation,a slidesupported on the bed and having a pattern follower, means for urging thepattern and follower into engagement one with the other, a grindingwheel carriage mounted on the slide and movable therewith and relativethereto, means for automatically effecting the relative movement of thecarriage and slide, means for iting thework approaching movement of thegrinding wheel, and means for automatically retracting the grindingwheel carriage wit respect to the slide.

6. A machine of the character described, including a bed, a work holderand a pattern supported bythe bed for synchronous rotation, a slidesupported on the bed and having a pattern follower, means for urging thepattern and follower into engagement one with the other, a grindingwheel carriage mounted on the slide and movable therewith and relas tivethereto, a grinding wheel on the carriage,

means for automatically eecting the relative movement of the carriageandslide,

' tion, a

means for automatically limiting the work approaching movement of thegrinding wheel, a device operable by the limiting means for retractingthe grinding Wheel to an inoperative position, and means for axiallyshifting the grinding wheel unit when in retracted position.

A machine of the character described, including a bed, a work holder anda pattern supported by the bed for synchronous rotaslide supported onthe bed and having a pattern follower, pattern and follower intoengagement one with the other, a grinding wheel carriage mounted on theslide and movable therewith and relative thereto, means forautomatically effecting the relative movement of the parts,

means for automatically limiting the work approaching movement of thegrinding wheel and for retracting the grinding wheel to an inoperativeposition, means for axially shifting the grinding wheel unit Vwhen inre- .p tracted position, and means for automatically checking said axialshifting movement.

8. A machine of the character described, including a bed, a work holderand a pattern supported by the bed for synchronous rotation, a slidesupported on the hed and having a pattern follower, means for urging thepattern and follower into engagement one with the other, a grindingwheel carriage mounted on the slide and movable therewith and relativethereto, means for automatically effecting the relative movement of theparts, means for automatically limiting the work approaching movement ofthe grinding retracting the grinding wheel automatically lim-- means forurging thel to an inoperative position, shifting the grinding wheel unitwhen in retracted position, means for -automatically checking said axialshifting movement, and means operative on checklng of the axial movementof the grinding wheel unit for reversely shifting the wheel to cause thesame to reengage a work piece.

9. A machine of the character described, including a work support and aWheel support, means for relatively shifting said parts in twodirectionsat right angles one to the other, said means including anhydraulic mechanism for effecting the relative approach and retractionof the parts, automatic electric controls for actuating said hydraulicmechanism, and additional automatic means for intermittently relativelyshifting the parts in an axial direction.

10. A machine of the character described, including a work support and agrinding wheel support, means for relatively shifting said parts inv twodirections at right angles one to the other, said means including anhydraulic mechanism for effecting the relative approach and retractionof the parts, automatic electric controls for actuating said hydraulicmechanism, automatic means for intermittently relatively shifting theparts in an axial direction, and supplemental means for imparting anaxial oscillatory movement to the grindmg wheel.

' 11. A machine including a bed, a work support carried thereby, a tableslidably mounted thereon for movement axially of the work support, anintermediate slide carried by the table for movement toward and from thesupport, a carriage mounted on the slide for movement therewith andrelative thereto, a grinding wheel on'the carriage, means for urging theslide in the direction of the Work support, a pattern member forcontrolling the movement of the slide, means for automatically shiftingthe carriage on the slide in a direction toward the work at apslow rateof speed, means for limiting this approaching movement, and additionalmeans for rapidly separating the work and grinding wheel subsequent tothe operation of the limiting means.

12. A machine of the character described, including a bed, a worksupport carried thereby, a table slidably mounted thereon for movementaxially of the work support, an intermediate slide carried by the tablefor movement toward and from the support, a carriage mounted on theslide for movement therewith and relative thereto, a grinding wheel onthe carriage, means for urging the slide in the direction of the worksupport, a pattern member for controlling the movement of the slide,means for automatically shifting the carriage on the slide in adirecmeans for axially A grinding ment, means for rapidly separating thework and grinding wheel subsequent to the operation of the limitingmeans, means for imparting sliding movement to the table, a normallyopen electric control circuit for .said means, and means for closing thecircuit on reverse movement of the grinding wheel to laterally shift thewheel when in withdrawn position.

13. A machine of the character described, including a bed, a worksupport carried thereby, a table slidably mounted thereon for movementaxially of the work support, an intermediate slidecarried by the tablefor movement toward and from the support, a carriage mounted on theslide for movement therewith and relative thereto, a grinding wheel onthe carriage, means for urging the slide in the direction of the worksupport, a pattern member for controlling the movement of the slide,means for automatically shift-ing the carriage on the slide in adirection toward the work at a slow rate of speed, means for limitingthis approaching movement, means for rapidly separating the work andgrinding wheel subsequent to the operation of the limiting means, meansfor imparting sliding movement to the table, a normally open electriccontrol circuit for said means, means for closing the circuit on reversemovement of the grinding wheel to laterally shift the wheel when inwithdrawn position, and means for .adjustably limiting the lateralshifting of the grinding wheel.

14. A machine of the character described, including a bed, a worksupport carried thereby, a table slidably mounted thereon for movementaxially of the work support, an intermediate slide carried by the tablefor movement toward and from the support, a carriage mounted on theslide for movement therewith and relative thereto, a grinding wheel onthe carriage, means for urging the slide in the direction of the worksupport, a

pattern member for controlling the move.

ment of the slide, means for automatically shifting the carriage on theslide in a direction toward the work at a slow rate of speed, means forlimiting this approaching movement, means for rapidly separating thework and grinding wheel subsequent to ,the operation of the limitingmeans, means for imparting sliding movement to the table, a normallyopen electric control circuit for said means, means for closing thecircuit on reverse movement of the grinding wheel to laterally shift thewheel when in withdrawn position. means for adj ustably limiting thelateral shifting of the grinding wheel, and means for stopping theentire machine when a work piece has been completed thereby.

15. A machine of the character described, including a bed or. support, awork holder .carried thereby, a grinding wheel supported thereon, meansforl imparting relative advancing and retract-ing movement to said partsfor grinding, means for imparting a supplemental relative shifting ofthe parts during grinding whereby an irregular shape is formed on thework piece, means for relatively laterally shifting the parts when inseparated position to present new portions of the work in opposition tothe grinding wheel, and controls for the several shifting movements tosequentially actuate the parts whereby a series of portions of desiredconfiguration will be sequentially automatically produced on the work.

16. A machine of the character described, including a bed or support, awork holder carried thereby, a grinding wheel supported thereon, meansfor imparting relative advancing and retracting movement to said partsfor grinding, means for imparting a supplemental relative shifting ofthe arts during grinding whereby an irregular s ape is formed on thework piece, means for relatively laterally shifting the parts when inseparated position to present new portions of the work in opposition tothe grinding wheel, controls for the several shifting movements tosequentially actuate the parts whereby a series of portions of desiredconfiguration will be sequentially automatically produced on the work,and additional means for automatically rendering the several shiftingmechanisms inoperative at a predetermined point in the cyclic movementthereof.

17. A machine of the character described including a bed or support, awork holder and a pattern holder carried thereby, a slide supported bythe bed and movable in the direction of the work and pattern holder, agrinding wheel mounted on the slide for movement therewith and relativethereto, a lug projecting from the bed, means on the slide cooperatingwith the lug for urging the slide in the direction of the pattern, andmeans on the carriage cooperating with the lug to limit the movement ofthe carriage in said direction.

18. A machine of the character described including a bed or support, awork holder and a pattern holder carried thereby, a slide supported bythe bed and movable in the direetion of the work and pattern holder, agrinding wheel mounted on the slide for movement therewith and relativethereto, a lug projecting from the bed, means on the slide cooperatingwith the lug for urging the slide in the direction of the pattern, andmeans on the carriage cooperating with the lug to limit the movement ofthe carriage in said direction, and means including an electric circuitcontrolling device and means associated with said device for reversingthe direction of movement of the carriage.

19. In a grinding machine the combination with a bed, of a tabletranslatably mounted thereon, a grinding wheel supported by the tableand movable transversely thereon, a means for controlling the relativemovement of the several parts including a drive for translating thetable, a second drive for shifting the grinding Wheel relative to thetable, means operated by movement of the grinding Wheel in one directionfor initiating movement of the table in a predetermined direction, andmeans discontinuing the table movement and initiating movement of thegrinding wheel in a reverse direction.

20. A grinding machine of the character described including a bed or surt, a table mounted for movement longitu mall f of the ed, a 'grindingwheel supported i for movement therewith and for movement thereon,transversely of the bed, automaticmechanical means for longitudinallyshifting -the table on the bed, automatic hydraulic means -for shiftingthe grinding Wheel relative to the table, a sequential engageableelectric control actuated by movement of the table, a grinding wheel forcontrolling the operation of the mechanical and hydraulic actuatingdevice in predetermined cyclic sequence.

21. A machine of the character described the combination oi a bed with agrinding member movable longitudinally and transversely with respect tothe bed, and means for automatically moving the grinding wheel in aplurality of cyclic paths each comprising a feeding movement andretracting movement and a transverse shifting movement While retracted,whereby the grinding Wheel is successively brought into operativeengagement with a plurality of axially spaced portions of an individualwork piece.

22. A machine of the character described the combination of a bed with agrinding member movable longitudinally and transversely with respect tothe bed, means for automatically moving the grinding wheel in aplurality of cyclic paths each comprising a `feeding movement andretracting movement and a transverse shifting movement while retracted,whereby the grinding Wheel is successively brought into operativeengagement with a plurality of axially spaced portions of an individualWork piece, and means for imparting a supplemental reciprocatingmovement to thel grinding wheel to cause theWheel to traverse theportion of work being operated upon.

23. A machine of the character described the combination of a bed with agrinding member movable longitudinally and transversely with respect tothe bed, a means for automatically moving the grinding Wheel in aplurality of cyclic paths each comprising a feeding movement andretracting movement and a transverse shifting movement while retracted,whereby the grinding wheel is successively brought into operativeengagement with a plurality of axially spaced porby tie table thycoupled With said tions of an individual work piece, means forimparting a supplemental reciprocating movement to the grinding wheel tocause the Wheel to traverse the portion of Work being operated upon, andadditional means for imparting a back and forth movement to the tgrinding Wheel relative the Work during feeding. whereby irregular ornon-circular contour may be produced on a rotating Work piece.

24. A combination with a grinding machine including a bed and a tablemovable longitudinally of the bed, of a grinding wheel su ported by thetable and movable transverse y ereon, means for imparting movement tothe table and to the grinding Wheel, a control circuit actuable bymovement of the grinding Wheel in one direction for initiating movementof the table in an angularly related direction, means :for limiting themovement of the grinding Wheel in said direction, meansfor automaticallycheckin the table movement at a predetermined posltion in the strokethereof.

25. A combination with a grinding machine including a bed and a tablemovable longitudinally of the bed, of a grinding Wheel supported by thetable and movable transversely thereon, means for imparting movement tothe table and to the grinding Wheel, a control circuit actuable bymovement of the grinding wheel in one direction for initiating movementof the table in an anglarly related direction, means for limiting themovement'of the grinding Wheel in said direction, means forautomatically checking the table movement at a predetermined position inthe stroke thereof, a supplemental circuit last named means, and acontrolling device actuable by said circuit to move the grinding Wheelin the opposite direction.

26. A combination with a grinding machine including a bed and a tablemovable longitudinally of the bed, of a grinding Wheel supported by thetable and movable transversely thereon, means for imparting movement tothe table and to the grinding Wheel, a controlled circut actuable bymovement of the grinding Wheel in one direction for initiating movementot' the table in an angularly related direction, means for limiting themovement ofthe grinding Wheel in sai-d direction, means forautomatically checking the table movement at a predetermined position inthe stroke thereof, a supplemental circuit coupled with said last namedmeans, a controlling device actuable by said circuit to move thegrinding Wheel in the opposite direction, a stop member for limiting anddetermining the movement of the grinding Wheel in said latter directionand means disposed in the path of said member for reversing thedirection of movement of the grinding Wheel.

' ber and slide to respectively 27. A machine of the characterdescribed, the combination with a bed or support and a tabletranslatable thereon, of means 'for feeding the table in eitherdirection, a control member shiftable with the table for interruptingthe movement thereof and a plurality. of contact members disposedadjacent the table for stopping the table at a plurality of operativestations, the co-acting engagement between said members being such as toautomatically stop the table at the several prescribed stationsirrespective of the direction of movement of the table.

28. A machine of the character described including a bed` a Work supportand pattern support carried thereby, a slide movable transversely of thebed and having a contact for engagement With the pattern, a grindingmember carried" by the slide and movable therewith and relative thereto,hydraulic means for urging the slide in the direction of the pattern,additional hydraulic means for shifting the grinding member rela-tive tothe slide in the direction of the work while restricting the movement ofthe grinding member relative to the slide, whereby the pattern maycontrol the general forming movement thereof and means for hydraulicallyrapidly retracting the grinding memdisengage the Work and pattern.

29. A machine of the character described including a bed or support, aWork holder carried thereby, a grinding Wheel supported by the bed,means for imparting relative advancing and retracting movement to saidparts for grinding, means for relatively axially shifting the parts fromstation to station for sequential operation on a spaced portion of aWork piece in the Work holder, said means including a reversible drivingmember,

and means for intermittently coupling said' member with one of the partsfor shifting thereof in the direction determined by the direction ofoperation of the driving member, and means for rendering the drivingmember ineffective at a plurality of predetermined stations irrespectiveof the direction of actuation of the parts thereby.

30. A machine of the character described including a bed or support, aWork holder and a pattern holder carried thereby, a slide mountedthereon having a portion for cooperation with the pattern, a grindingWheel carriage mounted on the slide for movement therewith and relativethereto in the direction of movement of the slide, means for imparting arapid movement to the slide in a direction toward the pattern, means forimparting a slow feeding movement to the grinding Wheel carriage asrespects the slide and in the direction of the rapid advance of theslide, and means for rapidly jointly retracting the slide and carriage.

including a bed or support, a work holder and a pattern holder carriedthereby, a slide mounted thereon having a portion for cooperation withthe pattern, a grindingwheel carriage therewith and relative thereto inthe direction of movement of the slide, means for imparting a rapidmovement to the slide in a direction toward the pattern, means forimparting a slow feeding movement to the grinding Wheel carriage asrespects the slide and in the direction of the rapid advance of theslide, means for rapidly jointly retracting the slide and carriage, andmeans for cushioning the retracting movement of said parts.

In testimony whereof we aiiix our signatures.

ROBERT E. W. HARRISON. FRED S. HAAS.

3 1. A machine of the character describe'djmounted on the slide formovement"

